Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0db05b9f4863e8…

MALICIOUS

PDF

71.7 KB Created: 2021-01-26 06:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e80d4f16acf11be9006c6cae42ba91d0 SHA-1: 947569de2a8f3440f10fb25cfd29e250050bd9c8 SHA-256: ef0db05b9f4863e815d6c101afb0ba23ebc48aae203e80839bcd51950b861b30
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified as a link farm, suggesting an attempt to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/123?utm_term=rene+ricard+paintings+for+sale PDF link annotation
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/f0ea40233b63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488807/normal_5ff342414a4de.pdfIn PDF document text
    • https://xovipapapili.weebly.com/uploads/1/3/0/8/130873893/jawexiresarexewaki.pdfIn PDF document text
    • https://xopisamu.weebly.com/uploads/1/3/0/7/130776659/kexefukoxufas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446272/normal_6009a00d94e4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_6009eb43d3a70.pdfIn PDF document text
    • http://streamsweets.com/49027025973m5pih.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/android_view_saved_network_passwords.pdfIn PDF document text
    • http://bomepexajusopa.epizy.com/alice_in_wonderland_2016_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/children_s_songs_nursery_rhymes_video.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/83053151377.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/67389567206.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 5328 bytes
SHA-256: ee77f2587f90c42b7efa5d397b421a6314c0d06f81e8ea895ebbc75434f9992b
font_01_sfnt_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 10304 bytes
SHA-256: 1072af7442eaa0a92ad89ee8b46ce811f5dc8005be9d9165e90ec40f1897af16

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